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No it was solid state. An FM stereo car radio. I do have an EICO HF-85 that has tubes. That needs a rebuild. Yes I figured someone would say not to assume on the circuit boards. My camera isn't that great either so here goes. I appreciate the assist!🤩

Sorry Yoda! Yes that's all I could find on short notice. And when registering for this forum it didn't take right away. Had to get in touch with admin to fix the problem so I wasn't sure I was going to be able to get to post anything here. And I'm assuming the ones I chose are like the amp in my...

Yes it goes to ground lug on the preamp out jack. Hence I got confused as the trace on the board says "+" but viewing the photo of the board posted sort of shows the blue wire goes at that spot. Isn't ground "positive" on this amp? Will take photos as requested.

No. I assumed that since the wire is there it belonged somewhere. I could try it and see.

Thanks Chuck! I used one of those inexpensive temperature controlled 60 watt pencils with the digital read out. Had it set to like 300 +. Been sourcing caps in the meantime as zgrav suggests. Don't see any rebuild kits for the 7-100 circa 1973 or any year for that matter. I see there are...

I understand zgrav. Thank you! 😌 Yeah these days have to get while the getting is possible.

Yes, I realize that. :giggle: The photo is someone's who was pointing to the transistors. So the largest cap there would be suspect for the motorboating? What does one do on a 7-100 circuit, change all the caps as SOP for something this old?

Thanks zgrav! One of these? Arrows are not mine. Pre-existing photo.

Newly joined. Am not an electronics whiz. Last thing I ever built from scratch was a Heathkit car radio. Need some insight to a problem with an old 7-100 made in the early 70's. When I plug into the jack, get this loud low frequency motorboating. No guitar comes through. Prior to...